Process of filling teeth.



T. B. MAGILL.

PROCESS OF FILLING TEETH.

APPLIGATION FILED AUG.28, 1913.

1, 1 1 8,301 Patented Nov. 24, 1914.

WITNESSES IN l/EIV TOR THE NORRIS PETERS CO FHOTO-LITHQ. WASHINGTON, D C

'lUNITFiD STATES PATENT @FFIQE.

TI-IQMAS B. MAGILL, OF KANSAS CITY, MISSOURI, ASSIGNOR 'lO KEETON GOLDCOMPANY,OF KANSAS CITY, MISSOURI, A CORPORATION OF MISSOURI.

PROCESS OF FILLING TEETH.

4 Specification of Letters Patent.

Patented Nov. 24, 1914.

Application filed August 28,1913. Serial No. 787,199.

To all whom it may concern:

Be it known that I, THOMAS B. IVIAGILL, a citizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented certain new and useful Improvements in Irocesses ofFilling Teeth; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part of this specification.

My invention relates to a process of filling teeth, and has for itsprincipal object to provide a process whereby an inlay may be builtoutside of a patients mouth, and

thereby eliminate the painful and tedious process of building up afilling directly in a tooth cavity.

It is also an object of the invention to provide a process of thischaracter consisting of forming an impression, mold and inlay withoutheating the various parts, eX- cept, perhaps, heating of the wax tosecure the impression to a degree whereinexpansion and contraction isnegligible.

In order to better describe my improved process I have illustrated thesteps thereof in the accompanying drawings, wherein Figure I is aperspective view of a tooth having a cavity to be filled, and a piece ofmodeling compound with which the original impression may be taken. Fig.II shows the modeling compound as it is applied to the tooth to securethe impression. Fig. III is a view similar-to Fig. I, with theimpression of the cavity formed on the modeling compound. Fig. IV is aview of the piece of modeling compound in the condition illustrated inFig. III, with a body of cement applied to the impression. Fig. V is aperspective view of the cement model after its removal from the modelingcompound. Fig. VI is a perspective View of the cement model 'incased inreinforcement and showing the cavity of the model filled with Keetongold. Fig. VII is a perspective view of the cement model and formedinlay, showing the model broken to release the inlay. Fig. VIII is aview of the tooth after the inlay has been set.

Referring more in detail to the process,

.ing compound to form a model 6.

and to the drawings wherein the process is illustrated, in carrying outthe process, a cavity 1 in a tooth 2 is prepared in the usual manner,care being taken, however, to obviate undercutting, in order that the imuiession, which is afterward taken, may be drawn. When the cavity isprepared, a piece of modeling compound 3, of any suitable character, issoftened and its tip rolled between the fingers to form a cone 4. Whenthe modeling compound is formed, as described, the tip is again softeneduntil. Li is pliant, and then projected into the cavity in the tooth;sullicient pressure beingapplied tosecure projection of the compoundinto the entire cavity and the formation of a margin. about theedgcsthereof. lVhen the impression has been made, the modeling compoundis removed; the portion of the compound which was projected into thecavity forming an outstanding impression 5, on the end of the piece ofcompound, ha ving the exact outlines of the cavity in the tooth. Whenthe modeling compound has become sufficiently hardened, a body ofcoment, preferably of a quick hardening charactor, is placed over theend of the model- After the cement model has hardened the modelingcompound is again softened, so that the cement model may be removedtherefrom. WVhcn the model is removed from the modeling compound, acavity 7, having the exact outlines of the cavity 1 in the tooth, isleft in its face, which may then be filled with Keaton gold to form aninlay which may eventually be applied to the cavity of the tooth.

In order that gold may be applied to the model conveniently, I build upa reinforcement 8 around the model, preferably by softening the modelingcompound and welding the same to and about the model, until a structureof sullioient body to strengthen tllOJllOClQl and adapt same forconvenient handling, has been formed. The cavity 7 in the cement modelis then filled by placing small quantities of Keeton gold therein andpressing the material to place with ordinary plugger points; the fillingoperation continuing until the cavity in the model is completely filled.WVhcn the cavity is full of gold, the reinforcement is softened andremoved from the model and the inlay re moved from the model, preferablyby splitting the model in order to free the gold inlay therefrom. Theedges of the inlay are then treated to insure the removal of any foreignmatter therefrom, inlay cement is applied to the cavity in the tooth,and the inlay inserted into the cavity. After the inlay has beeninserted, its outer surface may be burnished to carry the edge of theinlay over the cement and onto the portion of the tooth that surroundsthe cavity, thereby protecting the cavity and the cement by which theinlay is held in place, or the burnishing may be done before the inlayis removed from the model.

It is apparent that by the present method,

an inlay is formed having the exact outlines of the cavity in the tooth,so that Whenthe inlay has been formed and is applied to the cavity, itwill fit exactly Without leaving space between the surfaces of the inlayand the Walls of the cavity, into Which fluid of any character may enterto disintegrate the walls of the cavity.

Having thus described my invention, What I claim as new therein anddesire to secure by Letters-Patent, is

1. The process of filling teeth consisting of securing an impression ofthe cavity to be filled, making a mold from the impression, investingthe mold in reinforcing material, plugging metal into said mold,removing the reinforcement and mold from the metal and applying themetal to the cavity in the tooth.

2. The process of filling teeth consisting of preparing an open cavity,securing an impression of said cavity and a portion of the surroundingtooth, applying material to the impression to form a mold of finitedepthso that the upper edge conforms to the contour of the surroundingtooth, in vesting the mold in a reinforcing base, plugging metal intosaid mold and filling the same to the contour of the mold of thesurrounding tooth' to form, an inlay, removing the base and mold fromsaid inlay and applying the inlay to the cavity in the tooth.

In testimony'whereof I afiix my signature in presence of two Witnesses.

THOMAS B. MAGILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

